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regulator: act8865: fix parsing of platform data 

The driver loops through all available regulators (ACT8865_REG_NUM)
and accesses pdata->regulators[i].platform_data without checking the
actual value of num_regulators in platform data, potentially causing a
invalid memory access.

Fix this and look up the regulator init_data by id in platform data.

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Tested-by Wenyou.Yang <wenyou.yang@atmel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Beniamino Galvani 2014-06-22 17:31:41 +02:00 committed by Mark Brown
parent 7171511eae
commit 48a1e1b50d
1 changed files with 21 additions and 8 deletions
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29
drivers/regulator/act8865-regulator.c
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@ -252,6 +252,22 @@ static inline int act8865_pdata_from_dt(struct device *dev,
}
#endif
static struct regulator_init_data
*act8865_get_init_data(int id, struct act8865_platform_data *pdata)
{
int i;
if (!pdata)
return NULL;
for (i = 0; i < pdata->num_regulators; i++) {
if (pdata->regulators[i].id == id)
return pdata->regulators[i].platform_data;
}
return NULL;
}
static int act8865_pmic_probe(struct i2c_client *client,
const struct i2c_device_id *i2c_id)
{
@ -261,7 +277,7 @@ static int act8865_pmic_probe(struct i2c_client *client,
struct regulator_config config = { };
struct act8865 *act8865;
struct device_node *of_node[ACT8865_REG_NUM];
int i, id;
int i;
int ret = -EINVAL;
int error;
@ -299,20 +315,17 @@ static int act8865_pmic_probe(struct i2c_client *client,
/* Finally register devices */
for (i = 0; i < ACT8865_REG_NUM; i++) {
id = pdata->regulators[i].id;
const struct regulator_desc *desc = &act8865_reg[i];
config.dev = dev;
config.init_data = pdata->regulators[i].platform_data;
config.init_data = act8865_get_init_data(desc->id, pdata);
config.of_node = of_node[i];
config.driver_data = act8865;
config.regmap = act8865->regmap;
rdev = devm_regulator_register(&client->dev, &act8865_reg[i],
&config);
rdev = devm_regulator_register(&client->dev, desc, &config);
if (IS_ERR(rdev)) {
dev_err(dev, "failed to register %s\n",
act8865_reg[id].name);
dev_err(dev, "failed to register %s\n", desc->name);
return PTR_ERR(rdev);
}
}